Thanks Jamon for starting this discourse!
First and foremost our population estimation routines serve the immediate needs and the related humanitarian supply chain in emergency phase. This refers to planning and coordination of logistics, of medical services and health care and water / sanitation infrastructure is of utmost importance. Here, (close-to) real-time monitoring is the appropriate means, in the highest detail possible.
In the longer term (care and maintenance phase including recovery/repatriation), the observation and assessment of impacts becomes more critical, but the scale of observation might gradually get coarser. Guiding questions are: How concrete population figures relate to the carrying capacity of the impacted spaces, how do resources diminish, to which degree the settlement structure is self-sustaining, what are secondary effects to security, but also increasing risk to health (e.g., Malaria) due to shifting land use patterns.
And here it transitions to the second part of your question, touching upon the issue of to which degree EO technology can be used to actually 'predict'. We often use the term spatial prediction, when referring to the interpolation of singular observations to space. Remote sensing, one may think, does not require this step, due to its spatially exhaustive sampling technique. However what me measure is not the phenomena itself, but - at best - one indication to it. We have an area intensive variable which needs to be translated, interpreted. And here we have to types of challenges, spatial resolution (the sampling distance) and the semantic gap, e.g. what means a reflection value of XY in terms of degradation? So spatial prediction means the translation of observations to information.
Now, (how) can we move from spatial prediction to temporal prediction (i.e., forecast)? Well, as compared to weather forecast we are not quite there yet. Systemic behaviour might be fairly predictable if only enough variables are modelled but this might be (still) limited for human group behaviour. Here data assimilation comes into play. We are experimenting with combining EO data with digital activities traced from social media data or any other real-time response of human presence. I did not highlight this in the paper ... but it is of course another quite important step in data assimilation. Anticipatory action requires the understanding of trends, of likely behaviour, of predictable patterns. Here we are at the dawn of what hybrid AI may provide in the future, while extrapolating trends in the biophysical domain (such as soil degradation, human-induced droughts, flooding etc.) is surely more straight forward then the actions of humans.
Happy to discuss this further, the exciting part is definitely what future capacities emerge from this convergence of different strands of technology coincide, once domain / practical expertise is fully integrated and real added-value information products are achieved.
All the best,
Stefan
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